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Realisation and evaluation of a start-stop journal bearing test-rig
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Realisering och utvärdering av en glidlagerrigg för start-stop-provning (Swedish)
Abstract [en]

While there has been substantial body of work in the field of journal bearing research, much of it is today theoretical or simulated due to today’s computing power. Scania produces experimental data from motor testing, but these are expensive and time consuming. Furthermore there is a difficulty in keeping a sufficiently controlled environment, which at times makes it hard to draw conclusions from testing results. They therefore wish to develop a test-rig which can evaluate friction and wear in journal bearings.

This thesis is a continuation of a project in the course

Advanced Machine Design given at KTH Royal Institute of Technology. During this thesis the test-rig has been manufactured, built, and evaluated. Furthermore software for the test-rig was developed.

Information on journal bearings, risk assessment and signal noise handling were sought. Mechanical development was done with Autodesk Inventor, while Matlab was used for software development. Factorial design was utilised when designing tests and compared to a simple theoretical model.

Test results showed promising results for Stribeck curve-producing tests, with good resemblance to known frictional values and trends. Furthermore the test-rig showed good repeatability for replicated tests and produced wear on the bearing shells used. During a prolonged test, the shaft and support-bearings were damaged and requires servicing to be in an operational state.

The test-rig requires to be further verified, but the tests that were carried out showed valuable and reliable information on wear and frictional values.

Keywords: journal bearing, hydrodynamic lubrication, wear, start-stop, test-rig

Abstract [sv]

Även om en betydande mängd forskning inom glidlager och fullfilmslager har genomförts så är med dagens datorkapacitet en stor del av resultaten numera teoretiska eller simulerade. Medan Scania producerar experimentella resultat, så är dessa dyra och tidskrävande. Vidare är det ibland svårt att hålla en tillräckligt kontrollerad miljö för att dra slutsatser från proverna. Med en dedikerad testrigg som kan tillförlitliga resultat tas fram billigare och snabbare.

Detta examensarbete är en fortsättning av kursen

Avancerad Maskinkonstruktion som ges vid Kungliga Tekniska Högskolan. Under detta examensarbete har testriggen tillverkats, byggts och utvärderats. Vidare har programvara för testriggen utvecklats.

Informationssökning gjordes på glidlager, fullfilmslager, riskbedömning och signalbrushantering. Mekanisk utveckling har gjorts i Autodesk Inventor, medan Matlab användes för mjukvaruutveckling. Faktorial design har nyttjats vid utformningen av tester. Resultaten jämfördes med en enkel teoretisk modell.

Testresultaten visade lovade resultat för Stribeck kurva-producerande tester, med god likhet till kända friktionsvärden och trender. Testriggen visade god reproducerbarhet vid replikerade tester. Testriggen producerar slitage på samtliga testade lagerytor.

Under ett längre test så har axel och stödlager skadats, varför service behövs för att testriggen skall vara i brukbart skick.

Testriggen kräver ytterligare verifiering, men resultaten från de prov som genomförts visar att test-riggen ger värdefull och tillförlitlig information om slitage och friktion kunna utrönas.

Nyckelord: glidlager, hydrodynamisk smörjfilm, nötning, start-stop, testrigg

Place, publisher, year, edition, pages
2014. , 85 p.
Series
MMK 2014:22 MKN 112
Keyword [en]
journal bearing, hydrodynamic lubrication, wear, start-stop, test-rig
Keyword [sv]
glidlager, hydrodynamisk smörjfilm, nötning, start-stop, testrigg
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-156713OAI: oai:DiVA.org:kth-156713DiVA: diva2:767801
Supervisors
Examiners
Available from: 2014-12-02 Created: 2014-12-02

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